Make binding expose the preferred format

examples/Animometer.cpp

@@ -49,7 +49,8 @@ void init() {
 
     queue = device.CreateQueueBuilder().GetResult();
     swapchain = GetSwapChain(device);
-    swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, nxt::TextureUsageBit::OutputAttachment, 640, 480);
+    swapchain.Configure(GetPreferredSwapChainTextureFormat(),
+                        nxt::TextureUsageBit::OutputAttachment, 640, 480);
 
     nxt::ShaderModule vsModule = utils::CreateShaderModule(device, nxt::ShaderStage::Vertex, R"(
         #version 450

examples/CHelloTriangle.cpp

@@ -39,7 +39,8 @@ void init() {
         swapchain = nxtSwapChainBuilderGetResult(builder);
         nxtSwapChainBuilderRelease(builder);
     }
-    nxtSwapChainConfigure(swapchain, NXT_TEXTURE_FORMAT_R8_G8_B8_A8_UNORM, NXT_TEXTURE_USAGE_BIT_OUTPUT_ATTACHMENT, 640, 480);
+    nxtSwapChainConfigure(swapchain, static_cast<nxtTextureFormat>(GetPreferredSwapChainTextureFormat()),
+                          NXT_TEXTURE_USAGE_BIT_OUTPUT_ATTACHMENT, 640, 480);
 
     const char* vs =
         "#version 450\n"

examples/ComputeBoids.cpp

@@ -291,7 +291,8 @@ void init() {
 
     queue = device.CreateQueueBuilder().GetResult();
     swapchain = GetSwapChain(device);
-    swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, nxt::TextureUsageBit::OutputAttachment, 640, 480);
+    swapchain.Configure(GetPreferredSwapChainTextureFormat(),
+                        nxt::TextureUsageBit::OutputAttachment, 640, 480);
 
     initBuffers();
     initRender();

examples/HelloCompute.cpp

@@ -35,7 +35,8 @@ void init() {
 
     queue = device.CreateQueueBuilder().GetResult();
     swapchain = GetSwapChain(device);
-    swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, nxt::TextureUsageBit::OutputAttachment, 640, 480);
+    swapchain.Configure(GetPreferredSwapChainTextureFormat(),
+                        nxt::TextureUsageBit::OutputAttachment, 640, 480);
 
     struct {uint32_t a; float b;} s;
     memset(&s, 0, sizeof(s));

examples/HelloDepthStencil.cpp

@@ -116,7 +116,8 @@ void init() {
 
     queue = device.CreateQueueBuilder().GetResult();
     swapchain = GetSwapChain(device);
-    swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, nxt::TextureUsageBit::OutputAttachment, 640, 480);
+    swapchain.Configure(GetPreferredSwapChainTextureFormat(),
+                        nxt::TextureUsageBit::OutputAttachment, 640, 480);
 
     initBuffers();
 

examples/HelloIndices.cpp

@@ -49,7 +49,8 @@ void init() {
 
     queue = device.CreateQueueBuilder().GetResult();
     swapchain = GetSwapChain(device);
-    swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, nxt::TextureUsageBit::OutputAttachment, 640, 480);
+    swapchain.Configure(GetPreferredSwapChainTextureFormat(),
+                        nxt::TextureUsageBit::OutputAttachment, 640, 480);
 
     initBuffers();
 

examples/HelloInstancing.cpp

@@ -52,7 +52,8 @@ void init() {
 
     queue = device.CreateQueueBuilder().GetResult();
     swapchain = GetSwapChain(device);
-    swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, nxt::TextureUsageBit::OutputAttachment, 640, 480);
+    swapchain.Configure(GetPreferredSwapChainTextureFormat(),
+                        nxt::TextureUsageBit::OutputAttachment, 640, 480);
 
     initBuffers();
 

examples/HelloTriangle.cpp

@@ -83,7 +83,8 @@ void init() {
 
     queue = device.CreateQueueBuilder().GetResult();
     swapchain = GetSwapChain(device);
-    swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, nxt::TextureUsageBit::OutputAttachment, 640, 480);
+    swapchain.Configure(GetPreferredSwapChainTextureFormat(),
+                        nxt::TextureUsageBit::OutputAttachment, 640, 480);
 
     initBuffers();
     initTextures();

examples/HelloUBO.cpp

@@ -33,7 +33,8 @@ void init() {
 
     queue = device.CreateQueueBuilder().GetResult();
     swapchain = GetSwapChain(device);
-    swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, nxt::TextureUsageBit::OutputAttachment, 640, 480);
+    swapchain.Configure(GetPreferredSwapChainTextureFormat(),
+                        nxt::TextureUsageBit::OutputAttachment, 640, 480);
 
     nxt::ShaderModule vsModule = utils::CreateShaderModule(device, nxt::ShaderStage::Vertex, R"(
         #version 450

examples/HelloVertices.cpp

@@ -43,7 +43,8 @@ void init() {
 
     queue = device.CreateQueueBuilder().GetResult();
     swapchain = GetSwapChain(device);
-    swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, nxt::TextureUsageBit::OutputAttachment, 640, 480);
+    swapchain.Configure(GetPreferredSwapChainTextureFormat(),
+                        nxt::TextureUsageBit::OutputAttachment, 640, 480);
 
     initBuffers();
 

examples/RenderToTexture.cpp

@@ -167,7 +167,8 @@ void init() {
 
     queue = device.CreateQueueBuilder().GetResult();
     swapchain = GetSwapChain(device);
-    swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, nxt::TextureUsageBit::OutputAttachment, 640, 480);
+    swapchain.Configure(GetPreferredSwapChainTextureFormat(),
+                        nxt::TextureUsageBit::OutputAttachment, 640, 480);
 
     initBuffers();
     initTextures();

examples/SampleUtils.cpp

@@ -116,6 +116,10 @@ uint64_t GetSwapChainImplementation() {
     return binding->GetSwapChainImplementation();
 }
 
+nxt::TextureFormat GetPreferredSwapChainTextureFormat() {
+    return static_cast<nxt::TextureFormat>(binding->GetPreferredSwapChainTextureFormat());
+}
+
 nxt::SwapChain GetSwapChain(const nxt::Device &device) {
     return device.CreateSwapChainBuilder()
         .SetImplementation(GetSwapChainImplementation())
@@ -125,7 +129,7 @@ nxt::SwapChain GetSwapChain(const nxt::Device &device) {
 nxt::RenderPass CreateDefaultRenderPass(const nxt::Device& device) {
     return device.CreateRenderPassBuilder()
         .SetAttachmentCount(2)
-        .AttachmentSetFormat(0, nxt::TextureFormat::R8G8B8A8Unorm)
+        .AttachmentSetFormat(0, GetPreferredSwapChainTextureFormat())
         .AttachmentSetColorLoadOp(0, nxt::LoadOp::Clear)
         .AttachmentSetFormat(1, nxt::TextureFormat::D32FloatS8Uint)
         .AttachmentSetDepthStencilLoadOps(1, nxt::LoadOp::Clear, nxt::LoadOp::Clear)

examples/SampleUtils.h

@@ -24,6 +24,7 @@ struct GLFWwindow* GetGLFWWindow();
 
 nxt::Device CreateCppNXTDevice();
 uint64_t GetSwapChainImplementation();
+nxt::TextureFormat GetPreferredSwapChainTextureFormat();
 nxt::SwapChain GetSwapChain(const nxt::Device& device);
 nxt::RenderPass CreateDefaultRenderPass(const nxt::Device& device);
 nxt::TextureView CreateDefaultDepthStencilView(const nxt::Device& device);

examples/glTFViewer/glTFViewer.cpp

@@ -465,7 +465,8 @@ namespace {
 
         queue = device.CreateQueueBuilder().GetResult();
         swapchain = GetSwapChain(device);
-        swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, nxt::TextureUsageBit::OutputAttachment, 640, 480);
+        swapchain.Configure(GetPreferredSwapChainTextureFormat(),
+                            nxt::TextureUsageBit::OutputAttachment, 640, 480);
 
         renderpass = CreateDefaultRenderPass(device);
         depthStencilView = CreateDefaultDepthStencilView(device);

src/tests/NXTTest.cpp

@@ -142,7 +142,8 @@ void NXTTest::SetUp() {
     swapchain = device.CreateSwapChainBuilder()
         .SetImplementation(binding->GetSwapChainImplementation())
         .GetResult();
-    swapchain.Configure(nxt::TextureFormat::R8G8B8A8Unorm, nxt::TextureUsageBit::OutputAttachment, 400, 400);
+    swapchain.Configure(static_cast<nxt::TextureFormat>(binding->GetPreferredSwapChainTextureFormat()),
+                        nxt::TextureUsageBit::OutputAttachment, 400, 400);
 
     device.SetErrorCallback(DeviceErrorCauseTestFailure, 0);
 }

src/utils/BackendBinding.h

@@ -38,6 +38,7 @@ namespace utils {
             virtual void SetupGLFWWindowHints() = 0;
             virtual void GetProcAndDevice(nxtProcTable* procs, nxtDevice* device) = 0;
             virtual uint64_t GetSwapChainImplementation() = 0;
+            virtual nxtTextureFormat GetPreferredSwapChainTextureFormat() = 0;
 
             void SetWindow(GLFWwindow* window);
 

src/utils/D3D12Binding.cpp

@@ -275,6 +275,10 @@ namespace utils {
                 return reinterpret_cast<uint64_t>(&swapchainImpl);
             }
 
+            nxtTextureFormat GetPreferredSwapChainTextureFormat() override {
+                return NXT_TEXTURE_FORMAT_R8_G8_B8_A8_UNORM;
+            }
+
         private:
             nxtDevice backendDevice = nullptr;
             nxtSwapChainImplementation swapchainImpl = {};

src/utils/MetalBinding.mm

@@ -136,6 +136,10 @@ namespace utils {
                 return reinterpret_cast<uint64_t>(&swapchainImpl);
             }
 
+            nxtTextureFormat GetPreferredSwapChainTextureFormat() override {
+                return NXT_TEXTURE_FORMAT_R8_G8_B8_A8_UNORM;
+            }
+
         private:
             id<MTLDevice> metalDevice = nil;
             nxtDevice backendDevice = nullptr;

src/utils/NullBinding.cpp

@@ -32,6 +32,9 @@ namespace utils {
             uint64_t GetSwapChainImplementation() override {
                 return 0;
             }
+            nxtTextureFormat GetPreferredSwapChainTextureFormat() override {
+                return NXT_TEXTURE_FORMAT_R8_G8_B8_A8_UNORM;
+            }
     };
 
 

src/utils/OpenGLBinding.cpp

@@ -132,6 +132,10 @@ namespace utils {
                 return reinterpret_cast<uint64_t>(&swapchainImpl);
             }
 
+            nxtTextureFormat GetPreferredSwapChainTextureFormat() override {
+                return NXT_TEXTURE_FORMAT_R8_G8_B8_A8_UNORM;
+            }
+
         private:
             nxtDevice backendDevice = nullptr;
             nxtSwapChainImplementation swapchainImpl = {};

src/utils/VulkanBinding.cpp

@@ -32,6 +32,9 @@ namespace utils {
             uint64_t GetSwapChainImplementation() override {
                 return 0;
             }
+            nxtTextureFormat GetPreferredSwapChainTextureFormat() override {
+                return NXT_TEXTURE_FORMAT_R8_G8_B8_A8_UNORM;
+            }
     };